<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8"/>
    <title>Title</title>
</head>
<body>
    <ul>
        <li id = "l1" class = "c1">北京</li>
        <li id = "l2">上海</li>
        <li id = "l3">深圳</li>
        <li id = "l4">武汉</li>
    </ul>

    <ul>
        <li id = "c1">济南</li>
        <li id = "c2">济宁</li>
        <li id = "c3">沈阳</li>
    </ul>

</body>
</html>